300A Hall Effect Sensor – HT300M by Telcon

HT300M convert 300Amp DC Current to a 4 Vdc output.

Product Description

The HT300M Hall Effect Sensor by Telcon takes a 300A signal and outputs a corresponding 120mA signal.

The HT300M Hall Effect Sensor by Telcon is used for applications requiring an accurate, fast response signal proportional to the primary current being measured (AC or DC). The HT300M is suitable for Panel Mounting. It has a 2500:1 ratio, outputting 120mA at 300A. The output signal current type will reflect the current type of the primary (AC->AC or DC->DC).  The diameter opening is 26 mm.

Rated for 300A continuous operation, the HT300M offers high accuracy, high bandwidth and high electrical isolation. It weighs 110 grams.  It has 0.1% linearity and 0.65% accuracy overall.

The HT300M is UL listed, File No. E198118

Note that the Telcon HT300M ships with the mating connector (when ordered from Aim Dynamics)!

When searching for compatible power meters to this high accuracy DC current sensor, look for DC meters on our website that accept an Adc input. These meters will show the following symbol as the input:

DC Amperage

You can view all of our current sensors here.


  • Primary amperage range: 300 Adc or Aac
  • Outputs 0-120 mA
  • Limit of Linearity: ± 800A peak value
  • Linearity: 0.1% of nominal primary current
  • Overall Accuracy: 0.65% of nominal primary current
  • Powered by ±12 -5% to ±15V +5%
  • Delay time: < 0.5 ˜S
  • Temperature: -10 to +85 °C
  • Zero Offset/Temperature: < 3μ˜A/°C
  • Bandwidth: DC to 75kHz at -1dB, DC to 125kHz at -3dB
  • Proof Stress Voltage: 7kV a.c., rms for 1 minute

Data Sheet

Technical Specs


UL Listed


ISO 9001

rohs compliant

Additional information

Weight0.2 lbs
Dimensions3.3 x 2.2 x 2.2 in